Automatic Power Factor Correction

The 4 reasons to have Power Factor Corrections

Technical Convenience

The power factor correction reduces the”useless” current that affect lines and power components with the following benefits:

  • Optimized dimensioning of the components (transformers, switching devices, cables).
  • Reduction of voltage drops along the lines.
  • Reduction of losses due to joule effect.
  • Reduction of aging components.

Energy Efficiency

Power Factor Correction is widely convenient, both in the case of central and individual compensation, with Pay-Back less than or equal to 2 years.

Economic convenience

In addition to the economic benefits of the items mentioned in paragraph, The Electricity Authorities, force companies distributing electricity to apply financial penalties to utilities that have a substantial contractual power and low energy cos phi (generally 0,9). The correct power factor of the electric plant allows you to avoid those penalties, which often are not reflected in the bill, and then are paid by the final user without even realizing it.

Power Quality

In many industrial electric plants supplied by MT there is a tension considerably distorted, due often to excessive load of MV/LV transformer. The correct Power Factor Correction with a consequent load reduction by the transformer allow to bring it back to the operating conditions within the linearity limits, substantially reducing the voltage distorsion. Furthermore the proper Power Factor reduces the presence of harmonic currents.

Standard Power Factor Correction

The standard power factor correction is used in those plants where there are no current heavily deformed (verify the THD% data of the system current, which must be less than THDIR% of the selected power factor correction family) or resonance problems.

If the harmonics presence in the plant is not negligible, are preferred solutions with reinforced capacitors (i.e. with an higher nominal voltage than that of the network). In case of use in systems with heavy duty cycle, or in the case of installation in cabinets with high temperature, solutions with bimetallized paper capacitors are preferred.


from 200kvar
HP10High energy density polypropyleneTHDIR% = 12%
THDIC% = 50%
Un = 415V
HP20High energy density polypropyleneTHDIR% = 20%
THDIC% = 70%
Un = 460V
TC10Metallized PaperTHDIR% = 27%
THDIC% = 85%
Un = 400V
TC20Metallized PaperTHDIR% = 27%
THDIC% = 90%
Un = 460V


Power Factor Correction with blocking reactors

Solution used when a current flows in the electric system with a high harmonic content (THD) and / or with the resonance risk with the MV/LV transformer. This type of power factor correction is therefore to be preferred for systems with important non-linear loads (lighting not luminescent, power electronics, VSD, soft starters, induction furnaces, welding machines…).

from 100kvar
FH20High energy density polypropyleneTHDIR% < 60%
THDV% < 6%
fD = 180Hz (n=3,6)
FH30High energy density polypropyleneTHDIR% < 100%
THDV% < 6%
fD = 135Hz (n=2,7)
FD25Metallized PaperTHDIR% < 60%
THDV% < 6%
fD = 180Hz (n=3,6)


Try our Power Factor Correction ConfiguratorHow to extend your system warrantyHow make PFC Banks commissioning and test? Look the tutorial